Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
1999-04-19
2002-05-14
Lee, Cheukfan (Department: 2722)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S486000, C358S474000
Reexamination Certificate
active
06388778
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an image scanner, and more particularly, to an image scanner using one scanning pass to perform a preview scan and a formal scan.
2. Description of the Prior Art
Please refer to FIG.
1
.
FIG. 1
is a perspective view of a prior art image scanner
10
. The image scanner
10
comprises a housing
12
having a transparent platform
14
for placing a document
16
to be scanned, a calibrating area
18
installed in the housing
12
at a front end of the transparent platform
14
, and a scanning module
20
movably installed in the housing
12
for scanning the document
16
on the transparent platform
14
, a driving device (not shown) for driving the scanning module
20
, and a control circuit (not shown) for moving the scanning module
20
forward or backward. The calibrating area
18
comprises a white calibrating strip
24
and a black calibrating strip
26
for calibrating image signals generated by the scanning module
20
.
When performing a preview scan, the control circuit first uses the driving device to drive the scanning module
20
to scan the calibrating area
18
at the front end of the housing
12
. Then the scanning module
20
is moved backward to scan the document
16
positioned on the transparent platform
14
. Finally, the scanning module
20
is moved forward to the front end of the housing
12
. When the preview scan is performed, the control circuit stops moving the scanning module
20
and waits for a formal scan signal. When the control circuit receives a formal scanning signal, the control circuit again uses the driving device to drive the scanning module
20
to scan the calibrating area
18
, and then drives the scanning module
20
backward to scan the document
16
on the transparent platform
14
to perform a formal scan. Finally, the scanning module
20
is moved forward to the front end of the housing
12
.
Throughout this scanning process, time is wasted because the scanning module
20
has to make two scanning passes in the housing
12
to scan the document
16
. Although a high speed scanning module can help alleviate this problem, it is very costly.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide an image scanner using one scanning pass to perform a preview scan and a formal scan to solve the above mentioned problems.
Briefly, in a preferred embodiment, the present invention provides an image scanner comprising:
a housing having a transparent platform installed on it for placing a document;
a calibrating area installed in the housing at a front end of the transparent platform; and
a scanning module movably installed in the housing for scanning the document on the transparent platform;
wherein when performing a preview scan, the scanning module at a front end of the housing will move backward to scan the calibrating area to calibrate the scanning module and then scan the document on the transparent platform, and when performing a formal scan, the scanning module stopped at a rear end of the housing will move forward to scan the document and stop at the front end of the housing.
It is an advantage of the present invention that the scanning module using one scanning pass to perform a preview scan and a formal scan so the time for scanning is much reduced. It also obviates the need for an expensive high-speed scanning module.
These and other objects and the advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
REFERENCES:
patent: 5969845 (1999-10-01), Tsai et al.
patent: 6028681 (2000-02-01), Gray et al.
patent: 6278808 (2001-08-01), Tsai et al.
Hsu Winston
Lee Cheukfan
Primax Electronics Ltd.
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